Deep treatment Ch.2, referenced in Ch.9, Ch.14, Ch.17, Ch.18. Most frequent anchor. 2. **Dietary fat hypothesis / Ancel Keys** — Threaded through Ch.2, Ch.5, Ch.7, Ch.9, Ch.15. Extensive treatment. 3. **Neural networks / Minsky & Papert** — Ch.2 case study, Ch.13, Ch.17. Ch.29 DEEPEST treatment (com